package com.example.neptune.spinnertest_109zj;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
private TextView tvinfo;
    private Spinner spinner;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        init();

        //定义数据源
        String[] cities={"北京","上海","天津", "大连"};
        //实例化ArrayAdapter
       final ArrayAdapter<String> adapter = new ArrayAdapter<String>(
               this,
               android.R.layout.simple_spinner_item,
               cities
       );
        //设置下拉按钮样式
       adapter.setDropDownViewResource(
               android.R.layout.simple_spinner_dropdown_item);
        // 将spinner与ArrayAdapter绑定
        spinner.setAdapter(adapter);
        //Spinner点击事件
        spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {

                tvinfo.setText("您选择的是："+
                        adapterView.getItemAtPosition(i).toString());

            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {

            }
        });
        spinner.setPrompt("请选择城市");//本句为Spinner是对话框形式而设的标题

    }

    private void init() {
        tvinfo=(TextView)findViewById(R.id.textView);
        spinner=(Spinner)findViewById(R.id.spinner);

    }
}
